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최석호(Seokho Choi),이경우(Kyeongwoo Lee),천무환(Muhwan Chon),백민수(Minsu Paek) 한국유체기계학회 2004 유체기계 연구개발 발표회 논문집 Vol.- No.-
A vacuum system with ejector has been widely used because of its simple construction and easy maintenance. Ejectors are the main part of the vacuum system, of which designs determine the efficiency of vacuum system. The ejector with the capacity of l.5ton/hr steam consumption was designed and tested. The results showed that the tested values are satisfied with the designed specifications. Comparing with other ejectors designed by overseas specialist makers, it seems to have a good performance.
둔상성 외상 후 양측 간내 담관에서 담즙 누출의 치료 사례 1례
김동훈 ( Dong Hun Kim ),최석호 ( Seokho Choi ),고승제 ( Seung Je Go ) 대한외상학회 2014 大韓外傷學會誌 Vol.27 No.3
Bile leaks are complications that are much more frequent after a high-grade liver injury than after a low grade liver injury. In this report, we describe the management of bile leaks that were encountered after angiographic embolization in a 27-year-old man with a high-grade blunt liver injury. He had undergone an abdominal irrigation and drainage with a laparotomy on post-injury day (PID) 16 due to bile peritonitis and continuous bile leaks from percutaneous abdominal drainage. He required three percutaneous drainage procedures for a biloma and liver abscesses in hepatic segments 4, 5 and 8, as well as endoscopic retrograde cholangiopancreatography with biliary stent placement into the intrahepatic biloma via the common bile duct. We detected communication between the biloma and the bilateral intrahepatic duct by using a tubogram. Follow-up abdominal computed tomography on PID 47 showed partial thrombosis of the inferior vena cava at the suprahepatic level, and the patient received anticoagulation therapy with low molecular weight heparin and rivaroxaban. As symptomatic improvement was achieved by using conservative management, the percutaneous drains were removed and the patient was discharged on PID 82. [ J Trauma Inj 2014;27:89-93 ]
설계 조건에서 작동하는 축류 팬 주위 익단 누설 유동의 큰 에디 모사
박근태(Keuntae Park),최해천(Haecheon Choi),최석호(Seokho Choi),사용철(Yongcheol Sa) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
An axial fan with a shroud generates complicated vortical structures by the interaction of the axial flow with the fan blades and duct near the blade tips. Large eddy simulation (LES) is performed for flow through a forward-swept axial fan, operating at the design condition of Re = 547,000 based on the radius of blade tip and the tip velocity. The present study predicts the mean values of the flow and head coefficients quite well as compared with the experimental measurements. It is found that two unsteady vortical structures are formed near the blade tip: the tip leakage vortex (TLV) and vortex ropes. The TLV is initiated near the leading edge, develops downstream, and impinges on the pressure surface of the next blade, where the pressure fluctuations and turbulence intensity become high. Vortex ropes are initiated at the aft part of the blade and they merge with TLV.
축류 팬의 공력 성능과 소음 성능을 향상시키기 위한 케이싱 펜스의 적용
박근태(Keuntae Park),최해천(Haecheon Choi),최석호(Seokho Choi),사용철(Yongcheol Sa) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
A casing fence is a newly proposed casing treatment to enhance the aerodynamic and aeroacoustic performances of the axial flow fan that exhausts air into the atmosphere for cooling and ventilation. In the present study, the fence is applied on the shroud near the trailing edge of an axial flow fan used in an outdoor unit of an air conditioner operating at the design condition. The Reynolds number of the fan is 547,000 based on the radius of the blade tip and the tip velocity. We simulate turbulent flows and acoustic fields in the fan using large eddy simulation (LES) coupled with Ffowcs-Williams Hawkings (FW-H) equations. From the numerical simulations with the casing fence, the efficiency of the fan is increased by about 9.5% and the propagating noise is reduced by 0.5dB (A) compared with those without the fence. The fence decreases backflows induced by the tip-leakage vortex near the casing, suppressing the circumferential development of the tip-leakage vortex from the previous blade to the next blade. Also, it reduces the double-leakage tipclearance flow generated at the trailing edge of the blade tip. As a result, the blockage effect by the leakage flow is reduced and the efficiency is increased, and pressure fluctuations on blade surfaces due to the tip-leakage vortex are reduced, resulting in a reduction of the propagating noise.